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Assuming you have a Hydro workspace located in ~/hydrows, all you should have to do is compile the release you want in the workspace, and then the ROS should automatically use that version instead of the version in /opt/ros/hydro/.
cd ~/hydrows/src
wget https://github.com/ros-planning/navigation/archive/1.11.5.tar.gz
tar xvf 1.11.5.tar.gz
cd ~/hydrows
catkin_make
rm ~/hydrows/src/1.11.5.tar.gz
If the compilation succeeds you can test that ROS finds this version by typing roscd navigation and you should be taken to ~/hydrows/src/navigation-1.11.5/navigation. If compilation fails, you could try rosdep update and rosdep install navigation to ensure you have the proper dependencies.
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